Maiden, A. M.
Sarahan, M. C.
Stagg, M. D.
Schramm, S. M.
Humphry, M. J.
Article History
Received: 24 June 2015
Accepted: 3 September 2015
First Online: 1 October 2015
Competing interests
: Some of the methods described in this paper are the subject of awarded and pending patents owned by Phase Focus Ltd, which is a spin-out of the University of Sheffield and which intends to exploit commercially the imaging techniques described. M.J.H. and M.D.S. are employees of Phase Focus Ltd.